A member of a local civic group accused of breaching the anti-North Korea law has been under police probe for allegedly being involved in the group's formation, police said Thursday, the latest since two other members were indicted earlier this month.

A key member of the Corean Alliance, based in western Seoul, identified only by his surname Kim, 41, is suspected of being deeply involved in the formation of the group in 2011, the Gyeonggi Provincial Police Agency said.

The group reportedly has been working with another civic group that has been classified as benefiting the North.

It also has been accused of sending its co-chairwoman to the North so she could offer condolences for the death of then-North Korean leader Kim Jong-il in December 2011.

The National Security Law prohibits South Korean citizens from contacting North Koreans without government approval and engaging in activities benefiting the North. (Yonhap)